skeleton
• increased proteoglycan degradation following IL-1beta stimulation as reflected by the total amount of aggrecan released into the culture medium compared with cartilage explants from wild-type mice
• about 5 times higher prostaglandinE2(PGE2) production by mouse hip cartilage upon IL-1beta treatment compared with cartilage explants from wild-type mice
• no gross abnormalities of joints structure at 3 weeks of age
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